Lake St. Louis is a medium-sized city located in the state of Missouri. With a population of 18,337 people and four associated neighborhoods, Lake St. Louis is the 45th largest community in Missouri.

Lake St. Louis real estate is some of the most expensive in Missouri, although Lake St. Louis house values don't compare to the most expensive real estate in the U.S.

Also of interest is that Lake St. Louis has more people living here who work in computers and math than 95% of the places in the US.

A relatively large number of people in Lake St. Louis telecommute to their jobs. Overall, about 16.09% of the workforce works from home. While this may seem like a small number, as a fraction of the total workforce it ranks among the highest in the country. These workers are often telecommuters who work in knowledge-based, white-collar professions. For example, Silicon Valley has large numbers of people who telecommute. Other at-home workers may be self-employed people who operate small businesses out of their homes.

Lake St. Louis is a good choice for families with children because of several factors. Many other families with children live here, making it a place where both parents and children are more likely to develop social ties with other families. The city’s good public school district and large population of college-educated adults provide an environment conducive to academic success. Many people own their own single-family homes, providing areas for children to play and stability in the community. Finally, Lake St. Louis’s overall crime rate is lower than average for the country.

Being a small city, Lake St. Louis does not have a public transit system used by locals to get to and from work.

The citizens of Lake St. Louis are among the most well-educated in the nation: 49.71% of adults in Lake St. Louis have a bachelor's degree or even advanced degree, whereas the average US city has 21.84% holding at least a bachelor's degree.

The per capita income in Lake St. Louis in 2022 was $57,945, which is wealthy relative to Missouri and the nation. This equates to an annual income of $231,780 for a family of four.

Lake St. Louis is a somewhat ethnically-diverse city. The people who call Lake St. Louis home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Lake St. Louis residents report their race to be White, followed by Black or African-American. Important ancestries of people in Lake St. Louis include German, Irish, English, Italian, and French.

The most common language spoken in Lake St. Louis is English. Other important languages spoken here include Spanish and Other Asian languages.